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Dr. Alexey Root taught the Greenhill students five types of draws: by agreement, stalemate, three time repetition, 50-move rule, and insufficient material. For the stalemate, 50-move rule, and insufficient material draws, students, in pairs with chessmen and chess boards, came up with examples of stalemates and failed (correctly) to come up with examples of checkmates with insufficient material such as K and B vs. K